How to choose plastic mold steel
Choosing plastic mold steel is a very important process in mold manufacturing, because the classification of plastic mold are generally on the length of plastic mold by 5 grades, grade1 is over a million times; grade 2 is 500,000-100 million; grade3 is from 300,000 to 500,000; grade4 is from 100,000 to 300,000, grade 5 is [...]